Transformer



Nov. 5, 1945- c. H. mmwqm TRANS FORMER Filed March 14, 1944 @KMd/Q/ VAQ/Wzg/ Patented Nov; 6, 1945 UNITED STATES PATENT .YOFFICE 2,388,473 TRANSFORMER Charles H. Dunton, Berkeley, Calif. Application March 14, 1944, Serial No. 526,403 4 Claims. (Cl. 175356) This invention, a transformer, is a new and unconventional type of transformer in of the conventional ing its laminations ondary turns, and

primary and secondary, havencircling the cluster of seewith the primary alone wound are as follows:

First, to provide a transformer of a new and unusual type of construction.

Second, to provide a transformer which is highly efficient and which eliminates flux leakage across the ends of the coils.

Third, to provide the secondary wires and with the primary winding parallel to that of the secondary.

Fourth, to provide a transformer as outlined with a shield of highly-conductive rings encircling the secondary throughout its circular extent, and

secondary winding.

Fifth, to provide a transformer in which the secondary winding is completely enclosed b a shield formed of interlocking rings encircling the secondary and insulated from each other, and

the primary units along with the associated portions of the secondary and shield.

Fig. 3 is a section taken on line 33 of Fig. 2. Fig. 4 diagrammatically illustrates the invention.

The sleeve I3 is provided for the purpose of centering the secondary, and is made of insulatmaterial,

with substituted so long as ance is kept below one the cross-sectional resistmilohm.

but the respective complete rings are insulated l9, such as by mica, or by applying a thin film of Bakelite or similar facesvery little insulation being required because of the extremely low voltage set up in the rings.

at 22. Thus the secondary is completely shielded throughout its circular extent.

The primary core consists of ,laminations 23 which like the shield may consist of half rings with the joints staggered at assembly, to permit their assembly within, after the primary coils have been wound, to form a complete magnetic circuit about a portion of the secondary coil and shield.

The primary coil 2 is illustrated as consisting of only a single layer of a few turns over one portion of the core, which limitation in the drawing was made for clarity, though any number of turns or layers may be used, and the coil may be wound throughout the circular extent of the core, or a series of coils 24'--2Q" as illustrated in Figs. 2, 3 and 4 may be used, separate coils as shown facilitating the assembly of primary winding and core.

The primary coils in Fig. 1 are shown connected in series as indicated by the connections 25, though the transformer is not limited to series connections either between the respective primary units, or between respective coils in a primary unit Or on can be connected in series, series-parallel, or parallel, in accordance with the governing factors and the results to be achieved. The terminals of the primary circuit are shown at 2B and 21'.

In the diagram, Fig. 4, the secondary to is shown complete, with one half shield ring the diametric ends of which are l and i5", and one primary unit with two primary coils and opposite sections of the core indicated as 23 and 23".

The arrows indicate the flow of current, E. M, F. and flux in and between the respective elements, with the flux diametrically threading the secondary from the shield, and the E. M. F. set up by the secondary opposed diametrically in the shield. The shield is excited only through the flux from the secondary with consequent complete neutralization of the individual shield rings, with the flux in the adjacent faces of adjacent shield ring opposed and thereby neutralized.

In the event that cooling of the secondary and shield is found desirable, gravity circulation of fluid is secured simply by supporting the transformer at one corner at 28 and in an upright position, and providing an intake 28 and an outlet 29. Or in the position shown, force feed cooling'rnay be employed, by attaching the source of fiuid under pressure to one passage 28. The fluid will have equal resistance in both directions, passing through the clearances 30 formed by the projections ill on the outside of the sleeves l3, escaping through the diametric passage 29. Obviously other methods of cooling may be substituted, the simplest method having been illustrated.

It will be understood that variations in construction and arrangement of parts, which variations are consistent with the appended claims, may be resorted to Without detracting from the spirit or scope of the invention, or sacrificing any of the advantages thereof.

each core, either or both of which I claim:

1. A transformer, in combination, a magnetiz able ring core having a primary wound about a portion thereof with the turns parallel to the axis of the ring, and toroidal secondary winding comprising a plurality of turns and axially threaded through said ring core and extending about one side thereof with the turns parallel to those of the primary winding; a conductive nonmagnetic metal shield completely enclosing said secondary winding and passing, with the secondary therein, through said ring core, and iormed of rings of relatively small cross-section with interlocking faces insulated from each other.

2. A transformer comprising; a secondary winding of non-magnetic insulated metal wire, a magnetic core, and a primary winding formed about one side of said core with the lay of the wires parallel to those of the secondary winding, and a shield between the secondary winding and the core with its primary winding and consisting of non-magnetic racially interlocking conductive rings insulated one from the other, with each ring formed in segments to facilitate and with the ends of the segments or adjoining rings angularly stepped for interlocking by cooperating segments to form complete rings, said shield being formed throughout the circular extent of the secondary winding to completely shield the same.

3. A transformer comprising; a secondary coil consisting of a plurality of turns of insulated wire and of relatively large internal diameter; a laminated ring core encircling one side or said secondary winding, and a primary winding encircling one side of said ring core with the lay of the wires in primary and secondary parallel to each other; a shield encircling said secondary winding throughout its circular extent and passing through said ring core to shield the secondary winding against primary flux, and consisting of non-magnetic conductive rings having iacially cooperative locking means and with the faces insulated.

4. A transformer comprising; a secondary winding of relatively great circular extent; a plurality of primary units encircling equi-angularly spaced portions of said secondary winding and each consisting of a magnetizable ring core and a plurality of turns, and with the turns parallel to those of the secondary, with the primary windings electrically connected and having terminals. and terminals for the secondarywinding; a con ductive shield completely encircling said second= ary winding throughout its circular extent and consisting of a continuous series of non-magnetic rings insulated from each other and having co= operative interlocking means to align the peripheries of the rings, and each ring being {formed in segments to facilitate assembly.

CHARLES H. lflljlllfihl.

assembly, 

